Alexander W. Casdin
CIK 1455228 · last filed 2026-01-05
Alexander W. Casdin is a corporate insider who has filed 28 SEC Form 4 insider transactions across 4 companies since 2009. The most recent filing, for ERAS, was dated Jan 5, 2026. Across all open-market trades the lifetime net is +$7.1M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $9.4M across reported positions.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
$9.38M
4
28
$7.07M
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ERAS | Director | 667,724 | $14.05 | $9.38M | $384.4K | 13 | 2026-01-05 |
| Sientra, Inc. (SIEN) Delisted | Director | 252,099 | $0.17 | $43.9K | $0 | 1 | 2023-06-20 |
| Ignyta, Inc. (RXDX) Delisted | Director | 806,464 | $199.92 | $161.23M | $6.69M | 6 | 2017-06-19 |
| DUSA | Director | 0 | $56.18 | $0 | $0 | 7 | 2012-12-20 |
Recent Filings
28 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-01-05 | ERAS | Grant (A) | — | $0 | EDGAR |
| 2025-06-26 | ERAS | Grant (A) | — | $0 | EDGAR |
| 2025-01-02 | ERAS | Grant (A) | — | $0 | EDGAR |
| 2024-06-21 | ERAS | Grant (A) | — | $0 | EDGAR |
| 2024-05-22 | ERAS | Buy (P) | +80,000 | $181.9K | EDGAR |
| 2024-01-03 | ERAS | Grant (A) | — | $0 | EDGAR |
| 2023-12-04 | ERAS | Buy (P) | +30,000 | $49.8K | EDGAR |
| 2023-06-26 | ERAS | Grant (A) | — | $0 | EDGAR |
| 2023-06-20 | Sientra, Inc. (SIEN) Delisted | Grant (A) | +15,000 | $0 | EDGAR |
| 2023-04-11 | ERAS | Buy (P) | +20,000 | $55.2K | EDGAR |